Astrophysics Seminar

Astrolunch: Nathalia Cibirka (BGU)

Tue, 22/05/2018 - 12:30 to 13:30

A study of galaxy clusters through gravitational lensing: mass density profile and cluster abundance.
Dark matter halos associated with galaxy clusters are the biggest structures to have reached dynamical equilibrium, playing a central role both in providing cosmological information as well as astrophysical properties. 

astrolunch: Andrzej K. Drukier (OKC, Physics Dept., University of Stockholm)

Sun, 28/01/2018 - 13:00 to 14:00

Ultimate DM detector
We disclose an implementation of RT-bolometers which comprise high chemical-energy materials, e.g. explosive or catalase, H2O2}-system, that can be operated at temperature between 4 oC and room temperature (RT). Energy deposited by the incident weakly interacting particle to the nuclei can trigger a local release of chemical energy;. The energy release in such a `nano-explosion’ indicates that a coherent scattering event has taken place and allows for the localization of this event;

Extraordinary Astrolunch: Daniele Fargion

Sun, 04/11/2018 - 12:30 to 13:30

Title: First Tau Neutrino airshower astronomy ( and Signals?)
Abstract: PeV-EeV energy neutrino Tau may lead to a filtered and amplified upward tau Airshower Astronomy. Present and future experiment may ( already or soon) disentangle tau neutrino astronomy signals: ANITA, Grand, Poemma, Auger and other group are in rush for this peculiar neutrino horizons.

Astrolunch: Adi Nusser

Tue, 05/02/2019 - 12:30 to 13:30

Title: Dwarfs with little dark matter
Abstract: Dwarf galaxies (masses less than billions of solar masses) have traditionally been an interesting probe of the dark matter (e.g. the Tremaine-Gunn constraint). Following recent claims of little or no dark matter, I will present some puzzling consequences of the lack of dark matter on one hand and argue that there remains room for the presence of significant amount of dark matter on the other.

Astrolunch: Fangzhou Jiang

Tue, 04/12/2018 - 12:30 to 13:30

Title: Formation of ultra-diffuse galaxies in the field and in galaxy groups — and a sneak peek of a new semi-analytic model for satellite galaxies.